59 research outputs found
Eofelis edwardsi
No full textEofelis edwardsi (Filhol, 1872) (Fig. 5M) TYPE MATERIAL. — Lectotype, hemi-mandible, MNHN.F.QU9539, phosphorites du Quercy, designated by Ginsburg 1979: 45. NEW MATERIAL. — UM VBO 454, right upper canine. REMARKS This small feloid-like carnivoran was noted by Filhol (1872a) based on a mandible and described by the same author (Filhol 1872b) based on several specimens. Peigné (2000), in a revision of the genus, identified a total of 52 remains of E. edwardsi in many collections but only three from the upper jaw, with only one canine. Until now we had not found any remains of Eofelis in more than fifty years of excavations in the Quercy. Thus, the new discovery UM VBO4511 is significant. This canine is slightly curved, bucco-laterally compressed (mesio-distal diameter = 8.8 mm, bucco-lingual = 5.6 mm; ratio L/W = 1.57) the height from the tip of the crown to the base of the root is 37.3 mm (Fig. 5M 1, M 2). The buccal surface of the crown is slightly convex and the lingual one is quite flat. There are slight crenulations or serrations on the distal edge as indicated by Filhol (1872b: 6) for the lower canine of E. edwardsi and Peigné (2000: 657) for the lower and upper canines of the same species. The ratio L/W for the upper canine is close to that given by Peigné (2000: table 1) for E. edwardsi (1.5). The size is slightly greater than that of a specimen figured by Ginsburg (1979: fig. 10a, b) but the shape is similar. Another species, E. giganteus Peigné, 2000, is much larger and although its upper canine is unknown, cannot fit our specimen. Thus, we attribute UM VBO454 to E. edwardsi which is firmly dated for the first time.Published as part of Bonis, Louis de, Gardin, Axelle & Blondel, Cécile, 2019, Carnivora from the early Oligocene of the ' Phosphorites du Quercy' in southwestern France, pp. 601-621 in Geodiversitas 41 (15) on page 618, DOI: 10.5252/geodiversitas2019v41a15, http://zenodo.org/record/369420
Dinailurictis Helbing 1922
No full textGenus Dinailurictis Helbing, 1922 TYPE SPECIES. — Dinailurictis bonali Helbing, 1922 by original designation. REMARKS The genus was created by Helbing (1922) for fossils found in La Tuque (Lot & Garonne, France) in a molassic continental level which could be dated to the middle Oligocene. The remains consisted of a large scimitar-like upper canine, a P3 and a P4 most likely from the same animal. He added to the same sample a root of a large upper canine from Moissac whose size is similar to that of the La Tuque canine, but the geologic age of which is unknown because there are several levels from the middle and late Oligocene to the early Miocene in the Moissac area. Later, a fragment of maxilla with P3-P4 from the old Quercy collection was described as Nimravus intermedius major Piveteau, 1931. The latter author did not cite Helbing and probably was not aware of his article. The specimen was revised by Ginsburg (1979) and considered as the type species of the new genus Quercylurus Ginsburg, 1979. The main difference between the two genera was the size, Quercylurus being larger than Dinailurictis. The other characters (elongated protocone of P4, irregular minute pleating of the mesial crest of the paracone, m1 more robust) are linked to the larger size (slight allometry) or are also present in Dinailurictis.Published as part of Bonis, Louis de, Gardin, Axelle & Blondel, Cécile, 2019, Carnivora from the early Oligocene of the ' Phosphorites du Quercy' in southwestern France, pp. 601-621 in Geodiversitas 41 (15) on page 616, DOI: 10.5252/geodiversitas2019v41a15, http://zenodo.org/record/369420
Development of an Aeroelastic Simulation Framework for Leading Edge Inflatable Kites
No full textGreen Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Wind Energ
El philtrum novohispano, Creencia a cerca de la magia amorosa en México siglo XVII
No full textTesis para optar por el grado de Licenciatura en Etnohistori
Wind Gust Generation for Wind Turbine Testing via Numerical Methods
No full textThe modelling of gust generation by an array of oscillating vanes at Delft's University of Technology Open Jet Facility is proposed. Focus is placed on identifying relevant in-field gusts that horizontal axis wind turbines are exposed to and reproduction via numerical methods in the wind tunnel setting. A computationally efficient model is developed based on potential flow theory. The model validation showed good results overall, preserving general trends. Several vane configurations are proposed. Veer profiles representative of all atmospheric stability conditions are simulated as well as a maximum profile with veer angle difference between the top and bottom of the rotor of up to 20°. A coupling between the trailing vorticity of the vanes and achieved veer profile is identified. Temporal variation of the streamwise velocity component is achieved, however, not following the intended gust profile. Peak to trough velocity variation of up to 28% of the free stream value is observed. Furthermore, gust length scale was linked to vane spacing, limiting the possibility of small geometric scale testing.Aerospace Engineerin
Towards the CSM-CFD modelling of membrane wings at high Reynolds numbers
No full textThe field of Airborne Wind Energy is concerned with harvesting high-altitude wind power; the corresponding group in Delft, in particular, is investigating the suitability of a kite for this purpose. Due to the high complexity that such a system ensues, it is of interest to have a fundamental understanding of the critical aero-elastic modes of the structure in flight.The aim of this project was to further extend on the existing research efforts in this area by coupling a high fidelity Reynolds-Averaged Navier-Stokes solver with an improved version of the existing structural solver framework and validate the model on simplified test cases using a partitioned approach. The developed methodology uses the open-source Computational Fluid Dynamics solver foam-extend with an adapter to the coupling library preCICE. For the structure model, an in-house Python code based on a nonlinear shell element formulation is utilised.A literature survey revealed that while there exists an abundance of publications on strongly coupled Fluid-Structure Interaction problems, the majority of them are targeted at applications set in completely different flow regimes. Thus, the most difficult part of the project was to find appropriate validation data for membrane wings at high Reynolds numbersFinally, the capabilities of the method have been successfully showcased on a classic FSI benchmark case, and a partial validation on benchmark cases at more realistic Reynolds numbers has been carried out as well. Hence going forward a full quantification of the accuracy of the method for its target application range is recommended.Aerospace Engineering | Aerodynamics and Wind Energ
Numerical simulation of a forced and freely-vibrating cylinder at supercritical Reynolds numbers
No full textRecent innovations in the off-shore wind industry have lead to bigger wind turbines and taller support structures. These towers can suffer from vortex-induced vibrations (VIV). The present work couples the open-source CFD solver OpenFOAM with a structural solver to investigate these fluid-structure interactions (FSI) effects in more detail. 2D simulations are performed at supercritical Reynolds numbers and turbulence is modelled trough Unsteady Reynolds-Averaged Navier-Stokes (URANS). Two canonical VIV problems are considered: a transversely forced-vibrating and a transversely freely-vibrating (1 DOF) cylinder. Firstly, the aerodynamic damping was evaluated under different operating conditions by the forced-vibrating model. Furthermore, the effect of the structural mass, stiffness and damping parameters on the VIV response is analysed. Results will be summarised in terms of lock-in maps in the supercritical regime. Lastly, the reliability and accuracy of the CFD-FSI model has been assessed carefully. Eventually, these CFD results can be used to calibrate the phenomenological models for VIV at full-scale and are therefore a good compromise between engineering use and computational cost. Future work will investigate the effect of the spanwise flow component on the lock-in map, force magnification and wake patterns by means of large-eddy simulations.Aerospace Engineering | Aerodynamics and Wind Energ
Newcomers in the Bestiary. A Review of the Presence of Lycaon pictus in Late Predynastic and Early Dynastic Environment and Iconography
No full textInternational audienceIntroduction: Weighing the "Biocénose" Against the "Iconocénose" One of the best instances of possible collaboration between bioarchaeologists and "traditional" Egyptologists is the comparison between the three spheres of animal presence defined by Djindjian (2012). What this author calls "zoocénose", but which would usually (and perhaps best) be called "biocénose", can be defined as the whole fauna dwelling in a given environment at a given time. The "taphocénose" is, in turn, restricte
Newcomers in the Bestiary. A Review of the Presence of Lycaon pictus in Late Predynastic and Early Dynastic Environment and Iconography
No full textInternational audienceIntroduction: Weighing the "Biocénose" Against the "Iconocénose" One of the best instances of possible collaboration between bioarchaeologists and "traditional" Egyptologists is the comparison between the three spheres of animal presence defined by Djindjian (2012). What this author calls "zoocénose", but which would usually (and perhaps best) be called "biocénose", can be defined as the whole fauna dwelling in a given environment at a given time. The "taphocénose" is, in turn, restricte
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